4 DiffusionMovement of molecules from an area of high concentration to an area of lower concentrationExample: skunk, perfume, night after a dinner at taco bell!

5 Diffusion In ActionWhen molecules of a substance are in equal concentrations on both sides of a membrane, the molecules are said to have reached dynamic equilibrium.

6 DEMO (Perfume) What molecules moved?What direction did the molecules move?Location of molecules in the end?

7 DEMO (Strainer) What molecules moved?What direction did the molecules move?Location of molecules in the end?

8 DEMO (Food coloring) What molecules moved?What direction did the molecules move?Location of molecules in the end?How did heat effect the movement of the molecules?How did cold effect the movement of the molecules?

9 Factors that affect DiffusionTemperatureSize of ParticlesConcentration of Particles (number of molecules of a substance in a given volume )

13 Types of SolutionsHypertonic Solution = higher concentration of water in the cell than outside the cellHypotonic Solution = higher concentration of water outside the cell than inside the cellIsotonic Solution = equal concentrations of water inside and outside the cell